#include<stdio.h>
#include<math.h>
double x=0.0, minn = 999;
int main()
{
	for(x=0.00; x<=10.00; x+=0.01)
	{
		double yy = 54.0/x;
		if(x*x+yy < minn)
			minn = x*x+yy;
	}
	printf("%.2lf", sqrt(minn));
	return 0;
}
